163990241 has 2 divisors, whose sum is σ = 163990242. Its totient is φ = 163990240.

The previous prime is 163990223. The next prime is 163990247. The reversal of 163990241 is 142099361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140185600 + 23804641 = 11840^2 + 4879^2 .

It is an emirp because it is prime and its reverse (142099361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 163990241 - 2²⁶ = 96881377 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163990247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81995120 + 81995121.

It is an arithmetic number, because the mean of its divisors is an integer number (81995121).

Almost surely, 2^163990241 is an apocalyptic number.

It is an amenable number.

163990241 is a deficient number, since it is larger than the sum of its proper divisors (1).

163990241 is an equidigital number, since it uses as much as digits as its factorization.

163990241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 163990241 is about 12805.8674442616. The cubic root of 163990241 is about 547.3595099730.

The spelling of 163990241 in words is "one hundred sixty-three million, nine hundred ninety thousand, two hundred forty-one".